fix: test workflow installs all deps

Signed-off-by: Daniel Bluhm <dbluhm@pm.me>

Author: dbluhm

.github/workflows/tests.yml

@@ -19,6 +19,6 @@ jobs:
           python-version: ${{ matrix.python-version }}
           cache: true
       - name: Install dependencies
-        run: pdm install
+        run: pdm install -G :all
       - name: Run pytest
         run: pdm run pytest